function linkup() {
	local component=$1
	shift
	#do core
	for rk in $*; do
		if [ ! -e "../$rk/$component" ]; then
			ln -s "../shared/$component" "../$rk"
		fi
	done
}

#check they all exist first
for rk in lirk2 lirk3 wirk2 wirk3 mark2 mark3 sork2 sork3 derk cdrk2; do
	if [ ! -d "../$rk" ]; then
		echo "$rk not present"
		some_not_present=true
	fi
done
if [ "$some_not_present" == "true" ]; then
	exit
fi

linkup core lirk2 lirk3 wirk2 wirk3 mark2 mark3 sork2 sork3 derk cdrk2
linkup greenstone2 lirk2 wirk2 mark2 sork2 cdrk2
linkup greenstone3 lirk3 wirk3 mark3 sork3
linkup linux lirk2 lirk3 mark2 mark3 sork2 sork3 derk cdrk2
linkup windows wirk2 wirk3 sork2 sork3 cdrk2
linkup mac mark2 mark3